Hybrid EGR and turbocharging systems control for low NO and fuel consumption in an automotive diesel engine

Zamboni, Giorgio; Moggia, Simone; Capobianco, Massimo

doi:10.1016/j.apenergy.2015.12.117

Cited by 75 publications

(61 citation statements)

References 23 publications

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“…To obtain this operating mode, suitable A VNT control was applied in points No. 1 and 2 [19], while just increasing LP contribution in point No. 3 forced the ECU to close the HP EGR valve.…”

Section: Resultsmentioning

confidence: 94%

“…In-cylinder pressure diagrams were acquired through a dedicated system, sampling different signals at high frequency rates. More details on the measurement equipment used in this study are presented in [19]. …”

Section: Engine Test Facilitymentioning

confidence: 99%

“…As broadly discussed in a previous paper [19], most of the available experimental results presented in the literature are focused on large displacement engines [6,20,21]. On the other hand, investigations on dual loop EGR systems were developed mainly through numerical simulations [22][23][24], limiting test bench activities to model validation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine

2017

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Reduction of NO X emissions and fuel consumption are the main topics in engine development, forcing the adoption of complex techniques and components, whose interactions have to be clearly understood for proper and reliable operations and management of the whole system. The investigation presented in this paper aimed at the development of integrated control strategies of turbocharging, high pressure (HP) and low pressure (LP) exhaust gas recirculation (EGR) systems for better NO X emissions and fuel consumption, while analyzing their reciprocal influence and the resulting variations of engine quantities. The study was based on an extended experimental program in three part load engine operating conditions. In the paper a comparison of the behavior of the main engine sub-systems (intake and exhaust circuits, turbocharger turbine and compressor, HP and LP EGR loops) in a wide range of operating modes is presented and discussed, considering open and closed loop approaches for variable nozzle turbine (VNT) control, and showing how these affect engine performance and emissions. The potential of significant decrease in NO X emissions through the integration of HP and LP EGR was confirmed, while a proper VNT management allowed for improved fuel consumption level, if an open loop control scheme is followed. At higher engine speed and load, further actions have to be applied to compensate for observed soot emissions increase.

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Section: Resultsmentioning

confidence: 94%

Section: Engine Test Facilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine

2017

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“…The density of gases was evaluated measuring pressure and temperature in the sampling section of the smoke meter, thus allowing us to assess volumetric flow rate of exhaust An automatic data acquisition system performed low-frequency measurements in steady-state conditions, using virtual instruments developed in Labview ® , while data processing was developed in Excel ® , to calculate statistical parameters of observed quantities (average, standard deviation, variation coefficient) and the main engine parameters. Further details on experimental layout, instrument characteristics and uncertainties are presented in References [20,21].…”

Section: Engine Test Facilitymentioning

confidence: 99%

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Zamboni

2019

Applied Sciences

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Indicated pressure diagrams were measured during experimental campaigns on the control of fuel injection, turbocharging and hybrid exhaust gas recirculation systems in an automotive downsized diesel engine. Three-part load operating conditions were selected for four test sets, where strategies aimed at the reduction of NOX emissions and fuel consumption, limiting penalties in soot emissions and combustion noise were applied to the selected systems. Processing of in-cylinder pressure signal, its first derivative and curves of the rate of heat release allowed us to evaluate seven parameters related to the combustion centre and duration, maximum values of pressure, heat release and its first derivative, heat released in the premixed phase and a combustion noise indicator. Relationships between these quantities and engine operating, energy and environmental parameters were then obtained by referring to the four test sets. In the paper, the most significant links are presented and discussed, aiming at a better understanding of the influence of control variables on the combustion process and the effects on engine behaviour. The proposed methodology proved to be a consistent tool for this analysis, useful for supporting the application of alternative fuels or advanced combustion modes.

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“…This has resulted in more power from the same bore size and number of cylinders for an engine family. Other key drivers for engine development are low specific fuel oil consumption, which influences the direct operating costs of a ship, and environmental legislation limiting the level of harmful pollutants from diesel engines [2][3][4][5][6]. Rising fuel prices and enforcement of the legislation limiting the NO x and SO x from marine diesel engines have made these drivers more important [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Fundamental Analysis of Thermal Overload in Diesel Engines: Hypothesis and Validation

et al. 2017

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'Thermal Overload' can be defined as a condition under which design threshold values such as the surface temperature of combustion chamber components is exceeded. In this paper, a low λ value is identified as the most probable cause of voluminous flame production, resulting in high surface temperatures of engine components, i.e., engine thermal overload. Test results indicated that the flame became voluminous when the excess air ratio, λ was low, and the exhaust temperature increased from 775 to 1000 • C with λ changing from 1.12 to 0.71. Temperature indicating paints were applied on two piston crowns to investigate the effect of the voluminous flame on component surface temperature. The piston crown with high rates of hot corrosion was very close to matt glaze (much in excess of the design temperature), which proved that high surface temperature and salt deposition on the crown in the heavily burned away regions could have been caused by flame and fuel impingement, respectively. A numerical calculation was presented to estimate the flame temperature for various air excess ratio, which provides a guidance for the operation conditions of diesel engines to avoid engine thermal fatigue due to thermal overload.

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Hybrid EGR and turbocharging systems control for low NO and fuel consumption in an automotive diesel engine

Cited by 75 publications

References 23 publications

Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine

Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Fundamental Analysis of Thermal Overload in Diesel Engines: Hypothesis and Validation

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